If he's healthy, he'd be a good signing.
After I just wrote a bunch of crap about being fine with keeping Morse for 1B and letting LaRoche walk, I'll throw this out there - if Morse can bring back a cost-controlled starter like Niemann or Wade Davis from the Rays or someone like that, I'd probably pull the trigger on that. Someone threw out Jake McGee - he'd be fine I guess but he's strictly a reliever. He's about as good a pitcher as any prospect we might get for Morse though. Probably better.
Best case scenario to me is that they let LaRoche walk and use his money plus the non-tender money to bring in Greinke. I don't know if the Lerners will let Rizzo spend that kind of dough, but it seems like it should be doable. Plus, the following year, Morse's money comes off the books and he'll get replaced with a minimum salary guy like Rendon or Moore.